hoenix recently completed a study P designed to measure the effectiveness of two-way left-turn lanes (TWLTLS) throughout the city. Based on nearly 20 years of experience with TWLTLS in Phoenix, the engineering staff felt that TWLTLS not only provided excellent traffic service, but did so with an admirable safety record. However, until now, Phoenix has made no formal evaluation of the safety of TWLTLS. It is hoped that the information found in this study will encourage other practicing engineers to question, test, and publish their results as to the effectivenes
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